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Figure 12-26.
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The following schema joins three tables (Inventory, Equipment, and EqType). They are connected in the usual manner using the <sql:relationship> tag.
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<Schema name="Schema" xmlns="urn:schemas-microsoft-com:xml-data" xmlns:dt="urn:schemas-microsoft-com:datatypes" xmlns:sql="urn:schemas-microsoft-com:xml-sql"> <ElementType name="Inventory" content="eltOnly" model="closed" order="many"> <element type="Equipment" maxOccurs="*"> <sql:relationship key-relation="Inventory" key="EquipmentId" foreign-key="EquipmentId" foreign-relation="Equipment" /> </element> <AttributeType name="Inventoryid" dt:type="i4"/> <AttributeType name="EquipmentId" dt:type="i4"/> <AttributeType name="LocationId" dt:type="i4"/> <AttributeType name="StatusId" dt:type="ui1"/> <AttributeType name="LeaseId" dt:type="i4"/> <AttributeType name="LeaseScheduleId" dt:type="i4"/> <AttributeType name="OwnerId" dt:type="i4"/> <AttributeType name="Rent" dt:type="fixed.14.4"/> <AttributeType name="Lease" dt:type="fixed.14.4"/> <AttributeType name="Cost" dt:type="fixed.14.4"/> <AttributeType name="AcquisitionTypeID" dt:type="ui1"/> <attribute type="Inventoryid"/> <attribute type="EquipmentId"/> <attribute type="LocationId"/> <attribute type="StatusId"/> <attribute type="LeaseId"/> <attribute type="LeaseScheduleId"/> <attribute type="OwnerId"/> <attribute type="Rent"/> <attribute type="Lease"/> <attribute type="Cost"/> <attribute type="AcquisitionTypeID"/> </ElementType>
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<ElementType name="Equipment" content="eltOnly" model="closed" order="many"> <element type="EqType" maxOccurs="*"> <sql:relationship key-relation="Equipment" key="EqTypeId" foreign-key="EqTypeId" foreign-relation="EqType" /> </element> <AttributeType name="EquipmentId" dt:type="i4"/> <AttributeType name="Make" dt:type="string"/> <AttributeType name="Model" dt:type="string"/> <AttributeType name="EqTypeId" dt:type="i2"/> <AttributeType name="ModelSDX" dt:type="string"/> <AttributeType name="MakeSDX" dt:type="string"/> <attribute type="EquipmentId"/> <attribute type="Make"/> <attribute type="Model"/> <attribute type="EqTypeId"/> <attribute type="ModelSDX"/> <attribute type="MakeSDX"/> </ElementType> <ElementType name="EqType" content="empty" model="closed"> <AttributeType name="EqTypeId" dt:type="i2"/> <AttributeType name="EqType" dt:type="string"/> <attribute type="EqTypeId"/> <attribute type="EqType"/> </ElementType> <ElementType name="ROOT" sql:is-constant="1"> <element type="Inventory"/> </ElementType> </Schema>
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In the preceding examples with template files, it was not necessary to define a unique root element in the schema. The
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template took care of that requirement. In this case, you have to define the root element explicitly in the XML schema:
<ElementType name="ROOT" sql:is-constant="1"> <element type="Inventory"/> </ElementType>
You can see the complete tree of the XML document if you issue the following URL:
http://c400/asset/Schema/InvSchema.xml/ROOT
The XPath query refers to the <ROOT> node and all nodes that it contains. The result is shown in Figure 12-27.
Figure 12-27.
Using a template with inline mapping schema
SQL Server 2000 Stored Procedure Programming
You could use XPath to further filter the result. The following URL retrieves only Inventory nodes that have a StatusId attribute set to 2:
http://c400/asset/Schema/InvSchema.xml/ROOT/Inventory[@StatusId=2]
The result is shown in Figure 12-28.
Figure 12-28.
Filtering XML documents using an XPath query
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XML Support in SQL Server 2000
POSTing Queries to the Server
In previous sections, we demonstrated how you can access database information over HTTP using the GET method. This method is simpler to use for testing purposes you supply parameters in the URL after the -sign in the form of an ampersand (&) separated list. Unfortunately, this database access method has two problems:
You cannot expect even the most skilled users to be able to type proper queries in the form of a URL address. The size of the URL is limited to 2K, thus limiting the number and complexity of parameters.
HTTP s POST method does not set limitations on the size of a query, but it is even more difficult to use. You need a custom application (or component) to pass parameters to the Web server. The simplest version of such an application is an HTML form that uses the POST method to pass the content of its controls to the server. In this case, instead of passing it to an ASP page or some other component on the server, you need to pass it to the virtual directory that processes XML requests. We can demonstrate this technique using the following stored procedure with two parameters:
CREATE PROCEDURE prListEquipment3_xml @Make varchar(50), @Model varchar(50) AS select EquipmentId, Make, Model, EqType from Equipment inner join EqType on Equipment.EqTypeId = EqType.EqTypeId where Make like @Make and Model like @Model for xml auto GO
SQL Server 2000 Stored Procedure Programming
Next, we create a Web page with an HTML form. The form contains two visible controls that allow a user to specify the parameters of the query. There are also two hidden controls that will not be visible to the user, but that specify an XML template to be passed to the server and the content type in which the result is expected:
<head> <TITLE>Query Equipment</TITLE> </head> <body> <H3>Query Equipment (use % as wild card).</H3> <form action="http://C400/Asset" method="POST"> Make: <input type=text name=Make value='Tosh%'><BR> Model: <input type=text name=Model value='Por%'> <input type=hidden name=contenttype value=text/xml> <input type=hidden name=template value=' <ROOT xmlns:sql="urn:schemas-microsoft-com:xml-sql" > <sql:header> <sql:param name="Make">%</sql:param> <sql:param name="Model">%</sql:param> </sql:header> <sql:query> exec prListEquipment3_xml @Make, @Model </sql:query> </ROOT> '> <p><input type="submit"> </form> </body>
When a user opens this form, he or she is prompted to supply parameters (see Figure 12-29).
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